600 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



2. Genus represented by THANASIMUS and 



ENOCLERUS ICHNEUMONEUS, E. QUADRISIGNATUS, E. QUADRI- 



GUTTATUS, E. HUMERALIS, E. ROSMARUS, E. MUTTKOWSKII. 



Membranous parts imicolorous. Setae rather numerous, scattered. 

 Head with slightl}' curved sides, about as thick as long. Frons 

 sculptured. Epicranium dorsally rugose without protuberance, ver- 

 trally rugulose. Ocelli arranged in two subparallel, upwards and 

 backwards directed rows; anterior row with three, posterior row 

 with two ocelli, all of same size; distance from pleurostoma to the 

 anterior row as long as the basal joint of the antenna and to the 

 posterior row as long as basal and second antennal joints together; 

 upper posterior ocellus a trifle above upper anterior ocellus, lower 

 posterior ocellus a trifle below. Antenna with the length of basal, 

 second, and apical joints proportioned as 2^ : 1 : 1 ; supplementary 

 joint very small. Mandible with retinaculum well developed, at or 

 near the middle of inner margin ; in some species with a tooth between 

 retinaculum and tip of mandible. Maxilla well developed; length 

 from condyle of cardo to end of maxillary palpus in proportion to 

 gula as 3:5; both stipes and cardo with large subrectangular basal 

 chitinizations, the chitinization of cardo occupying two-thirds or 

 more of the whole cardo surface; maxillary palpus with joints grad- 

 ually decreasing in thickness from basal to apical joint; length of 

 basal, second, and apical joints proportioned as 1^ : 1 : 1 ; chitinization 

 of palpiger semicircular. Submentum with well developed square 

 chitinization between and adjacent to the chitinization of the cardines 

 and as long as these. Mentum with small transverse chitinization 

 and four setae. Stipes labii chitinized ; labial palpus with basal and 

 apical joints shaped and proportioned as second and apical joints of 

 maxillary palpus, and about as long and thick as these. Prothoracic 

 tergal shield, with length to width as 1 : 1^, along middle line about 

 as long as frontal suture ; prothoracic sternal plate narrowly lanceo- 

 late. Legs medium sized. Abdomen with normally developed inter- 

 segmental membranes; no dorsal ampullae; scuto-scutellar suture 

 entire, rather deep, with anterior and posterior branches distinct; 

 inferior branch usually indistinct; with slightly developed or no 

 asperities along the end of scuto-scutellar suture and its branches; 

 postscutellum normal. Spiracles pseudo-annuliform. 



The larvae of the different species of Thanasimus are congeneric 

 with those species of Enoclerus, which belong to the present genus 2, 

 as they have in common all the above-mentioned characters. It is 

 not considered advisable to maintain, in conformity with the adult 

 classification, a separate genus Thanasi?nus. even if all available 

 species of Thmiasimiis admittedly have cylindrical cerci with re- 



